rhel: Avoid losing bridge configuration after adding DPDK ports

rhel: Avoid losing bridge configuration after adding DPDK ports

Whenever a DPDK port is added to or deleted from an OVS bridge, the bridge
interface is reconfigured with the lowest MAC address among the connected DPDK
ports. When changing the MAC address, OVS performs a sequences of events
UP -> DOWN -> UP on the bridge interface. In deployments of OVS in RHEL
distribution this results in loosing Linux networking configuration attached to
the bridge interface (e.g. static routes).

This patch changes the interface configuration scripts used in a RHEL deployment
to trigger post-up operations on the bridge device after a change of MAC address.

Signed-off-by: Vishal Deep Ajmera <vishal.deep.ajmera@ericsson.com>
Signed-off-by: Flavio Leitner <fbl@sysclose.org>
Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Russell Bryant <russell@ovn.org>